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Finding the Fourth Proportional to 137,431.72, 207,207.13 and 136,578.76

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Solution

The fourth proportional to 137,431.72, 207,207.13 and 136,578.76 is: 205,921.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,431.72 : 207,207.13 = 136,578.76 : x
  2. Step 2: Convert to fraction form
    137,431.72/207,207.13 = 136,578.76/x
  3. Step 3: Cross multiply
    137,431.72x = 207,207.13 × 136,578.76
  4. Step 4: Simplify right side
    137,431.72x = 28,300,092,878.56
  5. Step 5: Solve for x
    x = 28,300,092,878.56/137,431.72
  6. Step 6: Final answer
    x = 205,921.11

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.